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Supplemental Cash Flow Information - Additional Information (Detail) (Frontline, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 30, 2013	Apr. 30, 2012
Frontline
Schedule of Cash Flow, Supplemental [Line Items]
Returns received on investment	$ 1,500	$ 950

This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

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